.page-about {
  --bar-w: 0%;
  --text-soft: #D5DFDA;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 28px 0 40px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7.2vw, 64px);
  line-height: 1.14;
  letter-spacing: 0.03em;
  color: var(--ice);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

.page-about .about-hero__text {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 62ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-hero__mark {
  position: relative;
  align-self: start;
  padding-left: 6px;
}

.page-about .about-hero__mark::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 12px;
  width: 78%;
  height: 66%;
  background: rgba(200, 255, 61, 0.09);
  transform: skewY(-6deg);
  pointer-events: none;
}

.page-about .about-hero__num {
  position: relative;
  display: block;
  font-size: clamp(96px, 24vw, 190px);
  line-height: 0.82;
  letter-spacing: 0.02em;
  color: var(--accent-text);
}

.page-about .about-hero__num-note {
  position: relative;
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--fog);
}

.page-about .about-stats {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats__item {
  background: var(--pitch);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stats__num {
  font-size: 26px;
  line-height: 1;
  color: var(--accent-text);
}

.page-about .about-stats__label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--fog);
}

/* ---------- 章节索引 ---------- */
.page-about .chapter-index {
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .chapter-index__list {
  list-style: none;
  margin: 0;
  padding: 12px 0;
  display: flex;
  gap: 8px;
  width: max-content;
  min-width: 100%;
}

.page-about .chapter-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  background: var(--pitch);
  color: var(--text-soft);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .chapter-index__link:hover,
.page-about .chapter-index__link:focus-visible {
  border-color: var(--accent);
  color: var(--accent-text);
  outline: none;
}

.page-about .chapter-index__no {
  font-size: 11px;
  color: var(--accent-text);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 16px;
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
  position: relative;
}

.page-about .chapter--last {
  border-bottom: 0;
}

.page-about .chapter__aside {
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .chapter__num {
  position: relative;
  display: block;
  font-size: clamp(38px, 9vw, 62px);
  line-height: 0.9;
  letter-spacing: 0.02em;
  color: var(--accent-text);
}

.page-about .chapter__num::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 2px;
  width: 120%;
  height: 74%;
  background: rgba(200, 255, 61, 0.08);
  transform: skewY(-6deg);
  pointer-events: none;
}

.page-about .chapter__vert {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--fog);
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.page-about .chapter__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 5vw, 34px);
  line-height: 1.25;
  letter-spacing: 0.02em;
  color: var(--ice);
}

.page-about .chapter__lead {
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 60ch;
}

.page-about .chapter__split {
  display: grid;
  gap: 26px;
}

.page-about .chapter__split--reverse {
  direction: ltr;
}

/* ---------- 图片 ---------- */
.page-about .figure {
  margin: 0;
  border: 1px solid var(--line);
  background: linear-gradient(165deg, var(--pitch), var(--arena));
  position: relative;
}

.page-about .figure--wide {
  margin-bottom: 28px;
}

.page-about .figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure__cap {
  display: block;
  padding: 9px 12px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--fog);
}

/* ---------- 赛季路线 ---------- */
.page-about .season-line {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .season-line__item {
  position: relative;
  border-left: 1px solid var(--line);
  padding: 0 0 22px 18px;
}

.page-about .season-line__item:last-child {
  padding-bottom: 0;
}

.page-about .season-line__item::before {
  content: "";
  position: absolute;
  left: -3px;
  top: 7px;
  width: 5px;
  height: 5px;
  background: var(--accent);
}

.page-about .season-line__item--now::before {
  background: var(--orange);
  width: 7px;
  height: 7px;
  left: -4px;
}

.page-about .season-line__tag {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--accent-text);
  margin-bottom: 6px;
}

.page-about .season-line__item--now .season-line__tag {
  color: var(--orange);
}

.page-about .season-line__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 工序 ---------- */
.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .steps__item {
  background: var(--pitch);
  padding: 20px 18px;
}

.page-about .steps__no {
  display: block;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--accent-text);
  margin-bottom: 10px;
}

.page-about .steps__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.35;
  letter-spacing: 0.02em;
  color: var(--ice);
}

.page-about .steps__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 团队条形图 ---------- */
.page-about .bars {
  display: grid;
  gap: 4px;
}

.page-about .bar {
  padding: 14px 0 12px;
  border-bottom: 1px solid var(--line);
  outline: none;
}

.page-about .bar:focus-visible {
  border-bottom-color: var(--accent);
}

.page-about .bar__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .bar__name {
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--ice);
}

.page-about .bar__count {
  font-size: 22px;
  line-height: 1;
  color: var(--accent-text);
}

.page-about .bar__track {
  display: block;
  height: 10px;
  background: var(--arena);
  border: 1px solid var(--line);
}

.page-about .bar__fill {
  display: block;
  height: 100%;
  width: var(--bar-w);
  background: linear-gradient(90deg, var(--board), var(--accent));
  transition: width 0.45s var(--ease), background 0.24s var(--ease);
}

.page-about .bar:hover .bar__fill,
.page-about .bar:focus-within .bar__fill {
  background: linear-gradient(90deg, var(--board), var(--cyan));
}

.page-about .bar__detail {
  margin: 0;
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.26s var(--ease);
}

.page-about .bar__detail > span {
  display: block;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.75;
  color: var(--fog);
}

.page-about .bar__detail > span::before {
  content: "";
  display: block;
  height: 8px;
}

.page-about .bar:hover .bar__detail,
.page-about .bar:focus-within .bar__detail {
  grid-template-rows: 1fr;
}

/* ---------- 数据来源 ---------- */
.page-about .sub-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .data-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .data-list__item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .data-list__mark {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
  padding-top: 3px;
}

/* ---------- 赛季规划手风琴 ---------- */
.page-about .plan {
  margin-top: 8px;
  border-top: 1px solid var(--line);
}

.page-about .plan__item {
  border-bottom: 1px solid var(--line);
}

.page-about .plan__summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 17px 2px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.06em;
  color: var(--ice);
  transition: color 0.18s var(--ease);
}

.page-about .plan__summary::-webkit-details-marker {
  display: none;
}

.page-about .plan__summary:hover,
.page-about .plan__summary:focus-visible {
  color: var(--accent-text);
  outline: none;
}

.page-about .plan__summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--accent-text);
}

.page-about .plan__item[open] .plan__summary::after {
  content: "–";
  color: var(--orange);
}

.page-about .plan__body {
  padding: 0 0 18px;
}

.page-about .plan__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 60ch;
}

/* ---------- 跟队约定 ---------- */
.page-about .pledge {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .pledge__card {
  background: var(--pitch);
  padding: 22px 18px;
  position: relative;
}

.page-about .pledge__no {
  display: block;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--accent-text);
  margin-bottom: 12px;
}

.page-about .pledge__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.35;
  letter-spacing: 0.02em;
  color: var(--ice);
}

.page-about .pledge__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  margin: 48px 0 56px;
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(200, 255, 61, 0.1), rgba(79, 216, 196, 0.06) 45%, rgba(6, 18, 15, 0) 78%),
    var(--pitch);
}

.page-about .about-cta__inner {
  padding: 30px 20px;
}

.page-about .about-cta__title {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 5.5vw, 40px);
  line-height: 1.2;
  letter-spacing: 0.03em;
  color: var(--ice);
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 58ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 880px) {
  .page-about .about-hero {
    padding: 40px 0 56px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
    align-items: end;
    margin-top: 34px;
  }

  .page-about .about-hero__mark {
    justify-self: end;
    text-align: right;
  }

  .page-about .about-hero__mark::before {
    left: auto;
    right: -10px;
    width: 82%;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 44px;
  }

  .page-about .chapter-index__list {
    padding: 14px 0;
  }

  .page-about .chapter {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 56px;
    padding: 96px 0;
  }

  .page-about .chapter__aside {
    position: sticky;
    top: calc(var(--util-h) + 40px);
  }

  .page-about .chapter__num {
    font-size: clamp(72px, 8vw, 112px);
  }

  .page-about .chapter__split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .chapter__split--reverse {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }

  .page-about .season-line__item {
    display: grid;
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
    padding-left: 24px;
  }

  .page-about .season-line__tag {
    margin-bottom: 0;
  }

  .page-about .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .steps__item {
    padding: 26px 22px;
  }

  .page-about .pledge {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .pledge__card {
    padding: 28px 22px;
  }

  .page-about .about-cta {
    margin: 64px 0 80px;
  }

  .page-about .about-cta__inner {
    padding: 52px 48px;
    max-width: 820px;
  }
}

@media (max-width: 879px) {
  .page-about .bar__detail {
    grid-template-rows: 1fr;
  }

  .page-about .bar__detail > span {
    color: var(--fog);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .bar__fill,
  .page-about .bar__detail,
  .page-about .chapter-index__link,
  .page-about .plan__summary {
    transition: opacity 0.2s linear;
  }
}
<<<END>>>